This awesomely gruesome Servo Skull sculpture was created by Spooky777, who used a medical skull model to give it a realistic edge and plenty of ewww factor.

In the world of Warhammer 40k:

SERVO-SKULLS are drone-like devices fashioned from human skulls [...] and then given a rudimentary Machine spirit, support systems, and anti-gravity engine to allow them to hover and drift bodiless through the air.

If nothing else, this sculpture will make for a great conversation piece!